Description
In the Linux kernel, the following vulnerability has been resolved: cpufreq: imx6q: fix devres accumulation across driver rebind imx6_soc_volt is allocated with devm_kcalloc(cpu_dev, ...), where cpu_dev is the CPU device from get_cpu_device(0). That device is never unbound, so its devres list is never released, and imx6q_cpufreq_remove() does not free the array either. Every probe therefore adds an allocation that stays for the lifetime of the system. Allocate against the platform device instead. Its devres is released when the driver is unbound, which is exactly the lifetime the array wants: imx6q_set_target() reads it, and nothing may reach that after cpufreq_unregister_driver(). That makes the array actually go away on unbind, so also clear the file-scope pointer in remove and on the failed-probe path, rather than leave it pointing at memory devres is about to release. Tested by rebinding the driver on qemu's mcimx6ul-evk.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 493c4d5982f037f288509a1cee352b8b9705fb38affectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < d91f07381e2b70578ff92b83d9422ac31e7b9096affectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 38d2c3c9238b9d499e1829a3b8e80c2f73c73b5caffectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 92e53a5274276a7b1ca815b9aacebea4fb7efe75affectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 9e314b3ecd2594958d4f4999313641290ad28ebeaffectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < e2d2612e63e294ebcdec7c6f08a1a052b7dfdc59affectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 0f77d1a0a25056146eea1f8619fa06ce287c91f7affectedb4573d1d657aae28bedf3a9a1f5367e09c80d1d6 to < 22c23c72c3b21fa3ec3db5070dfc0582794e0ef9affected
Linux Linux
Default version status: affected
3.14affected0 to < 3.14unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.110 to ≤ 6.12.*unaffected6.18.52 to ≤ 6.18.*unaffected7.2.6 to ≤ 7.2.*unaffected7.3 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/493c4d5982f037f288509a1cee352b8b9705fb38 ↗
- https://git.kernel.org/stable/c/d91f07381e2b70578ff92b83d9422ac31e7b9096 ↗
- https://git.kernel.org/stable/c/38d2c3c9238b9d499e1829a3b8e80c2f73c73b5c ↗
- https://git.kernel.org/stable/c/92e53a5274276a7b1ca815b9aacebea4fb7efe75 ↗
- https://git.kernel.org/stable/c/9e314b3ecd2594958d4f4999313641290ad28ebe ↗
- https://git.kernel.org/stable/c/e2d2612e63e294ebcdec7c6f08a1a052b7dfdc59 ↗
- https://git.kernel.org/stable/c/0f77d1a0a25056146eea1f8619fa06ce287c91f7 ↗
- https://git.kernel.org/stable/c/22c23c72c3b21fa3ec3db5070dfc0582794e0ef9 ↗